Opening PLANTUML Files

The PLANTUML file type is primarily associated with PlantUML.

PLANTUML	File extension: PLANTUML
	File type:	UML Diagrams

What is a PLANTUML file?

PLANTUML files mostly belong to PlantUML. A *.PLANTUML file stores a text-based description of a UML diagram, using the PlantUML language. It's designed to be easily written and modified by humans, while also being processable by the PlantUML tool to generate UML diagrams in various formats (e.g., PNG, SVG, PDF). The file's content consists of PlantUML directives and code that define the elements and relationships within the diagram.

How do you open PLANTUML files?

You need a suitable software like PlantUML to open a PLANTUML file. You need a suitable software like PlantUML to open a PLANTUML file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your PLANTUML file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a PLANTUML file directly in the browser:. Just drag the file onto this browser window and drop it.

Online PLANTUML Text Viewer

Choose your .plantuml file to analyze

or drag and drop it here

Online File Viewer

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.PLANTUML File Won't Open? Here is What You Can Do

Because .PLANTUML files can originate from various development environments, they aren't universally openable.

Identify the Source: If a developer or technical writer sent it, it likely contains plain-text UML diagram code used for software documentation workflows.
Check the Header: Open the file in a basic text editor to inspect its opening lines. You will typically see:
- @startuml tags, confirming it is a standard PlantUML script.
- Readable diagram syntax (e.g., Alice -> Bob), indicating plain text.
Use the Original Software: The original program is usually required to render the diagrams. Try opening it with PlantUML, Visual Studio Code, or IntelliJ IDEA, or ask the sender if you are unsure.
Use this Webpage: Drag and drop your file onto this page to detect the format, extract readable text, and preview it.

Technical Data for PLANTUML File Extension

File classification:

Developer Files, Text Files

Related files:

uml, erd, puml, asta

a plantuml UML Diagram is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with PLANTUML files

Associate the PLANTUML file extension with the correct application.
Update your software that should actually open uml diagrams. Because only the current version supports the latest PLANTUML file format. Search, therefore, e.g. on the manufacturer website after an available PlantUML update.
To make sure that your PLANTUML file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .PLANTUML file online - secure, fast, and no downloads needed.